What does a high lift camshaft do?
Designing a cam profile with more lift results in increased duration in the high-lift regions where cylinder heads flow the most air. Short duration cams with relatively high valve lift can provide excellent responsiveness, great torque, and good power. But high lift cams are less dependable.
How do you measure camshaft lift?
Simply measuring the diameter of the base circle, and subtracting that from the largest diameter of the cam, the lobe lift, will calculate the lift of the cam.
How do you raise a valve lift?
A different ratio rocker arm will change the valve lift, but not the lobe lift of a cam. You can therefore increase valve lift by using an increased rocker arm ratio. More cam lift means the valve will open further. Increasing cam lift will allow more air or exhaust to move through an engine.
What is a low lift cam?
low lift truck series The LLT1 and LLT2 camshafts are the Low Lift Truck Camshafts. These cams are specifically designed for trucks that are used as trucks. These cams do not require an upgraded torque converter or exhaust.
How do you adjust the SBC hydraulic roller lifters?
To adjust hydraulic lifters two fingers spin the pushrod as the lock nut is gently tightened. When resistance is felt on the pushrod, that’s zero lash. The adjuster is tightened to specs then the setscrew locks it in place. When changing valvetrain components always check rocker arm geometry.
How do I adjust my hydraulic lift camshaft?
Most hydraulic lift camshafts will require zero lash for the proper adjustment. The process will be the same whether you have stamped steel rockers or roller tip rockers. To achieve zero lash, tighten down the rocker as you spin the pushrod in your fingers, do this until you notice slight resistance as you spin the pushrod (this is zero lash).
What is the recommended lifter clearance for a roller cam?
The recommended lifter clearance is 0.0015 to 0.0020 inches. To create a more aggressive lobe profile, roller cam manufacturers often design a lobe with inverse profiles intended to create higher initial acceleration rates.
How do you advance the camshaft on a Chevy truck?
EXAMPLE: To advance the camshaft, you install the crankshaft sprocket using the keyway marked A. Then you align the A mark on the outer edge of the sprocket with the dot marked on the camshaft sprocket, mark to mark. You must use the corresponding marks on the crankshaft sprocket for proper installation. Cam Timing. Advancing.
What is a high lift profile cam?
Intended for performance hot street/strip and performance marine applications, these profiles have a moderate lope at idle and offer an extended rpm range with emphasis on upper bottom to top end power and a strong mid-range. These higher lift, longer duration camshafts demand close attention to rear end gearing and tire diameter combinations.